With her sisters, [[Banba]] and [[Fodla]], she was part of an important triumvirate of goddesses. When the [[Milesians_(Irish)|Milesians]] arrived from Spain each of the three sisters asked that her name be given to the country. Ériu ([[Éire]]) won the argument, but Banba and Fodla are still sometimes used as poetic names for Ireland, much as [[Albion]] is for [[Great Britain]].
According to [[Seathrún Céitinn]] she worshipped the [[Badb]], who is also sometimes named as a daughter of Ernmas. The two goddesses may therefore be seen as equivalent.